The study will determine the normal levels of CSF glucose using three different glucose meters (Nova Stat Strip, Abbott Precision Xtra and Roche Accucheck Inform 2 which are bedside devices that measure glucose). A glucose meter is used by people with diabetes to check their blood sugar levels using a drop of their blood. The results of this study will hopefully provide the basis for a further study that would look at whether it is possible to distinguish CSF from epidural fluid when spinal anesthesia is done following a failed epidural anesthetic. This could help prevent failures of spinal anesthesia in that situation.